Since updating adobe reader on Linux to 9.4.2, when I open a PDF portfolio created with Acrobat for Windows 9.4.2, the initial page is completely blank. It should show a thumbnail of the first page of each file in the portfolio, and this initial page still displays correctly when the portfolio is opened in the 9.4.2 Reader for Windows. I have two separate Linux machines, one running Ubuntu x84 and the other running Ubuntu amd64, and they both have the problem.

That's a complete PITA, then. Our local government, for example, commonly puts up PDF portfolios on their web site which consist of scans of multiple written responses to planning submissions bundled together into a PDF portfolio. Without the thumbnails of each contained PDF in the portfolio, it is impossible read anything other than the first PDF in the portfolio. Have a look for example, at http://www.actpla.act.gov.au/__data/assets/pdf_file/0014/22343/DV307_Submissions_1-20_1.37 MB.pdf. All submissions in this portfolio can be accessed without any problem using Reader 9.4.3 for Windows, but with Reader 9.4.3 for Linux, only the first submission in the document can be accessed.

Well, Update Manager on my Ubuntu installation indicated this morning that an update to Reader 9.4.6 was available, so I thought I'd download it and see if the portfolio bug was fixed. No such luck. PDF portfolios are still screwed on Adobe Reader for Linux. Still work fine on 9.4.6 for Windows.